Our 2 Rhode Islands are not the most aggressive in our flock, as some have mentioned theirs are. The largest of the two however is certainly the boss Hen of the flock, but she does it without aggression, though sometimes at the food dish she will chase a few away.
I have been very pleased with our 2 birds, they are great with people, and our boss hen looks out for the whole flock, she will stand by the coop door in the evenings till every last girl has entered the coop, if one is missing she will stand and call them to come.
They are a bit noisy, especially our smaller one, she honks like a goose when she is unhappy, or startled which she startles a lot. But we still love her! I will have Rhode Islands again for sure, of our flock they are my favorite birds.